#include "include/apue.h"

#define  BUFFSIZE 4096

int
main(int argcf, char* argv[])
{
    int         n;
    char        buf[BUFFSIZE];

    while ((n = read(STDIN_FILENO, buf, BUFFSIZE)) > 0)
        if (write(STDOUT_FILENO, buf, n) != n)
            err_sys("write error.");
    
    if (n < 0)
        err_sys("read error.");

    return 0;
}
